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RUDIKE [14]
3 years ago
7

1.) Rn-222 decays from 400 grams to 6.25 grams in 240 minutes. How long is one “half-life.

Physics
1 answer:
KiRa [710]3 years ago
7 0

Answer:

40

Explanation:

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3 years ago
Is our body in thermal equilibrium with the environment ?​
LenKa [72]

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The human body runs at a constant 37 ºC but the air around you at room temperature is about 20-25 ºC which means heat is constantly leaving your body to warm your surroundings and maintain thermal equilibrium. You don't lose much energy doing this however as air heats reasonably quickly

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2 years ago
What voltage produces a current of 50 amps with a resistance of 20 ohms?<br>​
PIT_PIT [208]

Answer:

1000 V

Explanation:

Ohm's law:

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V = (50 A) (20 Ω)

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3 years ago
TRUE or FALSE: During a collision between objects of different mass, there is a greater force applied to the less massive object
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4 0
2 years ago
(b) If TH = 500°C, TC = 20°C, and Wcycle = 200 kJ, what are QH and QC, each in kJ?
BigorU [14]

Answer:

QC = 122 KJ

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Explanation:

TH = 500 Degree C = 500 + 273 = 773 K

TC = 20 degree C = 20 + 273 = 293 K

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Use the formula for the work done in a cycle

Wcycle = QH - QC

200 = QH - QC    ..... (1)

Usse

TH / TC = QH / QC

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QH = 2.64 QC     Put it in equation (1)

200 = 2.64 QC - QC

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So, QH = 2.64 x 122 = 322 KJ

4 0
2 years ago
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